Issues encountered with assigning all ones IPv6 /64 address?

Sander Steffann sander at
Wed Oct 24 11:26:59 UTC 2012


> On a separate note, one of my customers discovered over the weekend
> that if they bring up an all ones IPv6 address in their /64
> (2001:db8:1:1:ffff:ffff:ffff:ffff) then they can't exchange traffic
> with stuff hosted at such as or
> Seems filtered somewhere inside Hetzner.
> I found the same if I brought up an all ones address in any other
> /64 in the same /48 as well. Using ...ffff:ffff:ffff:fffe worked
> fine.
> I haven't had time to investigate further or tell them yet, though.

I discussed this with Hetzner and it seems to be a bug in JunOS 10.3R1.9.
- Sander

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